Thermal power plant wastewater zero discharge treatment process method

Abstract

The invention relates to the field of wastewater treatment, and discloses a thermal power plant wastewater zero discharge treatment process method, which comprises the following steps: pretreatment: conveying wastewater into an adjusting tank, uniformly mixing the wastewater, adjusting the temperature, removing heavy metals and hardness ions through chemical precipitation, and removing suspended matters and organic matters through filtration and adsorption; evaporative crystallization: enabling the pretreated wastewater to pass through evaporative crystallization equipment to crystallize and separate out salt, separating the crystallized salt from mother liquor, and collecting the mother liquor; ion exchange: impurity ions in the mother liquor are detected, and corresponding ion exchange resin is selected for pretreatment. Effective separation and recovery of salt in the wastewater are realized through evaporative crystallization, and meanwhile, the energy utilization efficiency is improved; impurity ions in the mother liquor are effectively removed through ion exchange, meanwhile, through reasonable resin pretreatment, filling, operation monitoring and regeneration operation, stable and efficient operation of the ion exchange system is guaranteed, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a zero-discharge treatment process for wastewater from a thermal power plant. Background Art

[0002] Wastewater treatment refers to the process of treating various types of wastewater using physical, chemical and biological methods to make it meet the discharge standard or reuse standard. Its purpose is to remove pollutants in wastewater, protect the water environment and achieve sustainable use of water resources. Thermal power plants produce a large amount of wastewater during the power generation process. These wastewaters usually contain high concentrations of salt and other impurities. With the increasing shortage of water resources and the continuous improvement of environmental protection regulations, the requirement for zero discharge of wastewater from thermal power plants has become more urgent.

[0003] Among the traditional methods for zero-discharge treatment of wastewater from thermal power plants, the ion exchange process is not effective in treating wastewater with complex components, and lacks a coordinated optimization and dynamic adjustment mechanism for the entire treatment process. It is unable to effectively respond to wastewater treatment needs under different operating conditions, resulting in high treatment costs and unstable treatment effects. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a zero-discharge treatment process for wastewater from thermal power plants, which solves the problem that the ion exchange process in the traditional zero-discharge treatment process for wastewater from thermal power plants is not effective in treating wastewater with complex components, resulting in high treatment costs and unstable treatment effects.

[0005] To achieve the above objectives, the present invention is implemented by the following technical scheme: A zero-discharge treatment process for wastewater from a thermal power plant comprises the following steps:

[0006] S1. Pretreatment: The wastewater is transported to the regulating tank to be evenly mixed and the temperature is adjusted. Then, the heavy metals and hardness ions are removed by chemical precipitation, and the suspended matter and organic matter are removed by filtration and adsorption.

[0007] S2, evaporation crystallization: the pretreated wastewater is passed through an evaporation crystallization device to crystallize the salt therein, and the crystallized salt is separated from the mother liquor and the mother liquor is collected;

[0008] S3, ion exchange: detect the impurity ions in the mother liquor, select the corresponding ion exchange resin for pretreatment, then load the pretreated ion exchange resin into the ion exchange equipment and run it, and transport the mother liquor to the ion exchange equipment at a uniform speed to obtain the mother liquor with the impurity ions removed;

[0009] S4. Collection and analysis: corresponding sensors are set inside the evaporation crystallization equipment and ion exchange equipment to collect data in real time, and analyze it through big data analysis technology to obtain the influence of the data on the treatment effect;

[0010] S5, coupled cycle: the mother liquor with impurity ions removed is returned to the evaporation crystallization equipment, and then it is fully mixed with the newly entered pre-treated wastewater through a mixing device, and finally the various parameters of the evaporation crystallization equipment and the ion exchange equipment are dynamically adjusted based on the influencing rules.

[0011] Preferably, the temperature in step S1 is 20°C-30°C.

[0012] Preferably, the evaporation crystallization equipment in step S2 is a mechanical vapor recompression evaporation equipment or a multiple-effect evaporation equipment.

[0013] Preferably, in step S3, the impurity ions include heavy metal ions and ammonium ions, the ion exchange resin includes a macroporous strongly acidic cation exchange resin and a strongly basic anion exchange resin, the ion exchange equipment includes an ion exchange column, and the pretreatment includes the following steps:

[0014] S301, soaking the ion exchange resin in clean water for 24 hours, then soaking it in 5%-10% hydrochloric acid solution for 8-12 hours, stirring it every 2-3 hours during the soaking process, and then rinsing it with clean water until it is neutral; the stirring speed is 30-50 rpm;

[0015] S302, then soaking in 4%-6% sodium hydroxide solution for 8-12 hours, stirring every 2-3 hours during the soaking process, and finally rinsing with clean water again until neutral and draining, thereby completing the pretreatment, the stirring speed is 30-50 rpm.

[0016] Preferably, in step S3, the pretreated resin is loaded into the ion exchange device and operated, and the mother liquid is uniformly transported to the ion exchange device, comprising the following steps:

[0017] S3001, loading the pretreated resin into the ion exchange column, laying a quartz sand support layer at the bottom of the column during loading, and performing a sealing inspection and a pressure resistance test on the ion exchange column after loading;

[0018] S3002, after the measurement is completed, the mother liquor is controlled by the delivery pump to enter the ion exchange column at a uniform speed, and the impurity ion concentration is monitored by an online ion concentration monitor to determine the adsorption saturation of the ion exchange resin, and the pressure in the column is monitored by a pressure sensor, so as to obtain the mother liquor from which the impurity ions are removed;

[0019] S3003. When the ion exchange resin is saturated with adsorption, the amount of regenerant is calculated based on the total amount of ions adsorbed by the resin and the stoichiometric relationship between the regenerant and the exchanged ions. At the same time, the resin is regenerated using the corresponding regenerant, and after regeneration, the resin is rinsed with clean water to restore the initial ion exchange state.

[0020] Preferably, the corresponding sensors in step S4 include temperature sensors, pressure sensors, liquid level sensors, ion concentration monitors, and flow sensors.

[0021] Preferably, the analysis by big data analysis technology in step S4 includes the following steps:

[0022] S401, data cleaning: remove outliers and duplicate data in the collected data to obtain basic data;

[0023] S402, feature extraction: extracting parameter features related to process operation from basic data;

[0024] S403, correlation analysis: Analyze the relationship between various data through process simulation software, and build a mathematical model based on the actual process flow and equipment parameters. Substitute the real-time collected data into the model for simulation calculation to analyze the influence of various parameters on the overall processing effect.

[0025] Preferably, the parameter characteristics in step S402 include the temperature fluctuation range and the ion concentration change trend, the treatment effect in step S403 includes the quality of crystallized salt, the salt recovery rate, and the system energy consumption, and the mutual relationship includes the correlation between the evaporation temperature and the crystallized salt particle size, and the correlation between the ion exchange flow rate and the resin adsorption saturation time.

[0026] The present invention provides a zero-discharge treatment process for wastewater from thermal power plants. It has the following beneficial effects:

[0027] 1. The present invention realizes effective separation and recovery of salt in wastewater through evaporation and crystallization, while improving energy utilization efficiency; effectively removes impurity ions in the mother liquor through ion exchange, and ensures stable and efficient operation of the ion exchange system and reduces operating costs through reasonable resin pretreatment, filling, operation monitoring and regeneration operations; realizes comprehensive monitoring of the entire treatment process and data-driven in-depth analysis through collection analysis and coupled cycles, and improves overall stability and treatment efficiency through resource recycling and process adaptive optimization in the wastewater treatment process.

[0028] 2. The present invention ensures the recycling of water resources and reduces wastewater discharge by returning the mother liquor from which impurity ions have been removed to the evaporation and crystallization equipment, and then fully mixes the mother liquor with the newly entered pretreated wastewater through a mixing device to ensure that the composition of the mixed liquor entering the evaporation and crystallization equipment is uniform, avoids the influence of local concentration differences on the evaporation and crystallization process, and improves the quality and yield of the crystallized salt. Finally, according to the data obtained by collection and analysis, when an abnormal situation occurs, the parameters are adjusted in time to ensure that the entire treatment process can operate stably and efficiently under different working conditions, thereby improving the reliability and adaptability of zero-discharge treatment of wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a process flow chart of the zero-discharge treatment process for wastewater from a thermal power plant proposed by the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example:

[0032] Please refer to the attached Figure 1 The embodiment of the present invention provides a method for treating wastewater from a thermal power plant by zero discharge, comprising the following steps:

[0033] S1. Pretreatment: The wastewater is transported to the regulating tank to be evenly mixed and the temperature is adjusted. Then, the heavy metals and hardness ions are removed by chemical precipitation, and the suspended matter and organic matter are removed by filtration and adsorption.

[0034] S2, evaporation crystallization: the pretreated wastewater is passed through an evaporation crystallization device to crystallize the salt therein, and the crystallized salt is separated from the mother liquor and the mother liquor is collected;

[0035] S3, ion exchange: detect the impurity ions in the mother liquor, select the corresponding ion exchange resin for pretreatment, then load the pretreated ion exchange resin into the ion exchange equipment and run it, and transport the mother liquor to the ion exchange equipment at a uniform speed to obtain the mother liquor with the impurity ions removed;

[0036] S4. Collection and analysis: corresponding sensors are set inside the evaporation crystallization equipment and ion exchange equipment to collect data in real time, and analyze it through big data analysis technology to obtain the influence of the data on the treatment effect;

[0037] S5, coupled cycle: the mother liquor with impurity ions removed is returned to the evaporation crystallization equipment, and then fully mixed with the newly entered pre-treated wastewater through a mixing device, and finally the various parameters of the evaporation crystallization equipment and the ion exchange equipment are dynamically adjusted based on the influence rules;

[0038] The temperature in step S1 is 20°C-30°C;

[0039] The evaporation crystallization equipment in step S2 is a mechanical vapor recompression evaporation equipment or a multiple-effect evaporation equipment.

[0040] Specifically, by conveying the wastewater to the regulating tank, the wastewater is evenly mixed and the temperature is adjusted, and then the heavy metals and hardness ions are removed by chemical precipitation, and the suspended matter and organic matter are removed by filtration and adsorption, so as to ensure that the physical properties of the wastewater are relatively stable in the subsequent treatment process, avoid the impact of temperature differences or uneven water quality on the treatment effect, and reduce the hardness of the water to prevent scaling in the subsequent equipment, affecting the operation and treatment efficiency of the equipment, reduce the interference with the subsequent evaporation crystallization and ion exchange process, and improve the stability and treatment effect of the entire treatment process, thereby creating good conditions for the subsequent evaporation crystallization and ion exchange treatment, reducing the risk of equipment failure, and improving the treatment efficiency and reliability of the overall process;

[0041] The pretreated wastewater is passed through an evaporation crystallization device to crystallize the salt therein, and the crystallized salt is separated from the mother liquor and the mother liquor is collected, so that the collected mother liquor can be further processed, and the crystallized salt can be recycled as a resource, thereby improving energy utilization efficiency and reducing resource waste. The obtained crystallized salt product has a higher quality and can meet the needs of industrial applications;

[0042] By detecting the impurity ions in the mother liquor and selecting the corresponding ion exchange resin for pretreatment, the pretreated ion exchange resin is then loaded into the ion exchange equipment and operated, and the mother liquor is uniformly transported to the ion exchange equipment to obtain the mother liquor with the impurity ions removed, so that the resin is in the best ion exchange activity state, the removal ability of specific impurity ions is improved, the ion exchange effect is enhanced, the safety and stability of the entire ion exchange process is guaranteed, the impurity ions in the mother liquor are effectively removed, the quality of the mother liquor is improved, the operating cost is reduced, and the utilization rate of the resin is increased, thereby ensuring the long-term stable operation of the ion exchange process;

[0043] By installing corresponding sensors inside the evaporation crystallization equipment and ion exchange equipment, real-time data is collected and analyzed through big data analysis technology to obtain the influence of data on the treatment effect, so as to comprehensively monitor the entire treatment process and conduct in-depth data-driven analysis, which provides strong support for process optimization and stable operation, can timely discover potential problems, and improve treatment efficiency and product quality;

[0044] By returning the mother liquor from which impurity ions have been removed to the evaporation and crystallization equipment, the recycling of water resources is ensured and wastewater discharge is reduced. Then, the mother liquor is fully mixed with the newly entered pre-treated wastewater through a mixing device to ensure that the composition of the mixed liquor entering the evaporation and crystallization equipment is uniform, avoiding the influence of local concentration differences on the evaporation and crystallization process, and improving the quality and yield of the crystallized salt. Finally, various parameters of the evaporation and crystallization equipment and the ion exchange equipment are dynamically adjusted based on the influencing law. According to the data obtained by the collection and analysis, the parameters are adjusted in time when abnormal situations occur, such as adjusting the resin regeneration parameters and evaporation and crystallization parameters when the impurity ion concentration in the mother liquor changes after ion exchange, or adjusting the seed addition amount, liquid level height and ion exchange flow rate, resin selection, etc. when the crystallized salt particle size is abnormal during the evaporation and crystallization process. This dynamic adjustment mechanism can ensure that the entire treatment process can operate stably and efficiently under different working conditions, and improve the reliability and adaptability of zero-discharge treatment of wastewater;

[0045] Through the coordinated operation of the various steps of the method, the wastewater treatment efficiency is enhanced, the treatment cost is reduced, and the wastewater treatment is made continuous and stable, thereby solving the problem that in the traditional thermal power plant wastewater zero-discharge treatment process, the ion exchange process is not effective in treating mother liquor with complex components, resulting in high treatment costs and unstable treatment effects.

[0046] In step S3, the impurity ions include heavy metal ions and ammonium ions, the ion exchange resin includes a macroporous strongly acidic cation exchange resin and a strongly basic anion exchange resin, the ion exchange equipment includes an ion exchange column, and the pretreatment includes the following steps:

[0047] S301, soaking the ion exchange resin in clean water for 24 hours, and then soaking it in 5%-10% hydrochloric acid solution for 8-12 hours, stirring it every 2-3 hours during the soaking process, and then rinsing it with clean water until it is neutral; the stirring speed is 30-50 rpm;

[0048] S302, and then soaking in 4%-6% sodium hydroxide solution for 8-12 hours, stirring every 2-3 hours during the soaking process, and finally rinsing with clean water again until neutral and draining, thereby completing the pretreatment, the stirring speed is 30-50 rpm.

[0049] Specifically, impurities such as metal ions remaining in the ion exchange resin production process can be removed by soaking in a 5%-10% hydrochloric acid solution, and acidic impurities can be removed by soaking in a 4%-6% sodium hydroxide solution, thereby improving the purity of the resin and preventing these impurities from affecting the treatment effect or contaminating the mother liquor in the subsequent ion exchange process;

[0050] The functional groups of the resin are converted into suitable forms by soaking in hydrochloric acid and sodium hydroxide, respectively, so that the resin has better adsorption selectivity and exchange capacity for the target ions during the ion exchange process, thereby enhancing the efficiency of ion exchange;

[0051] Stirring during the soaking process can ensure that the resin is in full contact with the soaking solution, so that the inside and surface of the resin can be evenly treated, avoiding the situation of inadequate local treatment, and ensuring that each resin is in a good pre-treatment state.

[0052] In step S3, the pretreated resin is loaded into the ion exchange device and operated, and the mother liquid is uniformly transported to the ion exchange device, including the following steps:

[0053] S3001, loading the pretreated resin into the ion exchange column, laying a quartz sand support layer at the bottom of the column during loading, and performing a sealing inspection and a pressure resistance test on the ion exchange column after loading;

[0054] S3002, after the measurement is completed, the mother liquor is controlled by the delivery pump to enter the ion exchange column at a uniform speed, and the impurity ion concentration is monitored by an online ion concentration monitor to determine the adsorption saturation of the ion exchange resin, and the pressure in the column is monitored by a pressure sensor, so as to obtain the mother liquor from which the impurity ions are removed;

[0055] S3003. When the ion exchange resin is saturated with adsorption, the amount of regenerant is calculated based on the total amount of ions adsorbed by the resin and the stoichiometric relationship between the regenerant and the exchanged ions. At the same time, the resin is regenerated using the corresponding regenerant, and after regeneration, the resin is rinsed with clean water to restore the initial ion exchange state.

[0056] Specifically, by laying a quartz sand support layer at the bottom of the ion exchange column, the resin bed can be effectively supported to prevent resin particles from flowing out of the ion exchange column with water during operation, thereby ensuring the normal operation of the ion exchange column, avoiding the decline in treatment effect and potential damage to subsequent equipment caused by resin loss, and performing a sealing inspection and a pressure test on the ion exchange column. The sealing inspection can prevent mother liquid leakage, avoid environmental pollution and reduced treatment efficiency; the pressure test ensures that the ion exchange column will not have safety problems such as rupture within the normal operating pressure range, and also ensures that the resin bed works under a stable pressure environment, which is conducive to the smooth progress of the ion exchange process;

[0057] The mother liquor is controlled to enter the ion exchange column at a uniform speed by the delivery pump, and the impurity ion concentration is monitored by the online ion concentration monitor, so that the adsorption of impurity ions by the ion exchange resin can be grasped in real time, and the degree of resin adsorption saturation can be accurately determined. This helps to adjust the treatment process in a timely manner, such as preparing for regeneration operations when the resin is close to saturation, to ensure the continued effectiveness of the ion exchange process. At the same time, the pressure in the column is monitored by the pressure sensor. When the pressure changes abnormally, possible blockages, abnormal flow and other problems can be discovered in time, to prevent damage to the resin bed or ion exchange column structure due to excessively high or low pressure, and to ensure the safety and stability of the entire ion exchange process.

[0058] By calculating the amount of regenerant added based on the total amount of ions adsorbed by the resin and the stoichiometric relationship between the regenerant and the exchanged ions, and regenerating the resin with the corresponding regenerant, the functional groups of the resin can be accurately restored, the adsorption capacity for impurity ions can be regained, the service life of the resin can be effectively extended, and the operating cost can be reduced. After the regeneration is completed, the resin is rinsed with clean water to restore the initial ion exchange state, which can completely remove the regenerant and reaction products remaining on the surface and inside of the resin, avoid these substances from interfering with the next round of ion exchange process, and ensure that the resin can operate in the best state when it is put back into use; a series of operations from loading to operation and regeneration ensure the normal operation of the ion exchange equipment, the efficient and stable ion exchange process, and the long-term maintenance of the resin performance, so that the impurity ions in the mother liquor can be continuously and effectively removed to obtain high-quality treated mother liquor.

[0059] The corresponding sensors in step S4 include a temperature sensor, a pressure sensor, a liquid level sensor, an ion concentration monitor, and a flow sensor;

[0060] The analysis by big data analysis technology in step S4 includes the following steps:

[0061] S401, data cleaning: remove outliers and duplicate data in the collected data to obtain basic data;

[0062] S402, feature extraction: extracting parameter features related to process operation from basic data;

[0063] S403, correlation analysis: Analyze the relationship between various data through process simulation software, and build a mathematical model based on the actual process flow and equipment parameters, substitute the real-time collected data into the model for simulation calculation, and analyze the influence of various parameters on the overall processing effect;

[0064] The parameter characteristics in step S402 include the temperature fluctuation range and the ion concentration change trend. The treatment effect in step S403 includes the quality of crystallized salt, the salt recovery rate, and the system energy consumption. The mutual relationships include the correlation between the evaporation temperature and the crystallized salt particle size, and the correlation between the ion exchange flow rate and the resin adsorption saturation time.

[0065] Specifically, by removing outliers and duplicate data from the collected data, the impact of erroneous data caused by sensor failure, environmental interference and other factors on subsequent analysis is eliminated, making the basic data obtained more accurate and reliable, providing a high-quality data source for subsequent analysis;

[0066] By extracting parameter characteristics related to process operation from basic data, such as temperature fluctuation range, ion concentration change trend, etc. These key parameter characteristics can help operators quickly understand the core status of process operation without complex analysis of a large amount of raw data, providing an intuitive basis for timely problem discovery and process optimization;

[0067] By analyzing the relationship between various data through process simulation software, we can deeply understand the internal connection between different parameters, such as the correlation between evaporation temperature and crystallized salt particle size, the correlation between ion exchange flow rate and resin adsorption saturation time, etc. By building a mathematical model based on the actual process flow and equipment parameters, and substituting the real-time collected data into the model for simulation calculation, we can accurately analyze the influence of various parameters on the overall treatment effect (crystallized salt quality, salt recovery rate, system energy consumption, etc.), and provide precise guidance for optimizing process parameters.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zero-discharge treatment process for wastewater from a thermal power plant, characterized in that: The following steps are involved: S1. Pretreatment: The wastewater is transported to the regulating tank to be evenly mixed and the temperature is adjusted. Then, the heavy metals and hardness ions are removed by chemical precipitation, and the suspended matter and organic matter are removed by filtration and adsorption. S2, evaporation crystallization: the pretreated wastewater is passed through an evaporation crystallization device to crystallize the salt therein, and the crystallized salt is separated from the mother liquor and the mother liquor is collected; S3, ion exchange: detect the impurity ions in the mother liquor, select the corresponding ion exchange resin for pretreatment, then load the pretreated ion exchange resin into the ion exchange equipment and run it, and transport the mother liquor to the ion exchange equipment at a uniform speed to obtain the mother liquor with the impurity ions removed; S4. Collection and analysis: corresponding sensors are set inside the evaporation crystallization equipment and ion exchange equipment to collect data in real time, and analyze it through big data analysis technology to obtain the influence of the data on the treatment effect; S5, coupled cycle: the mother liquor with impurity ions removed is returned to the evaporation crystallization equipment, and then it is fully mixed with the newly entered pre-treated wastewater through a mixing device, and finally the various parameters of the evaporation crystallization equipment and the ion exchange equipment are dynamically adjusted based on the influencing rules.

2. The zero-discharge treatment process for wastewater from a thermal power plant according to claim 1, characterized in that: The temperature in step S1 is 20°C-30°C.

3. The zero-discharge treatment process for wastewater from a thermal power plant according to claim 1, characterized in that: The evaporation crystallization equipment in step S2 is a mechanical vapor recompression evaporation equipment or a multiple-effect evaporation equipment.

4. The zero-discharge treatment process for wastewater from a thermal power plant according to claim 1, characterized in that: In step S3, the impurity ions include heavy metal ions and ammonium ions, the ion exchange resin includes a macroporous strongly acidic cation exchange resin and a strongly basic anion exchange resin, the ion exchange equipment includes an ion exchange column, and the pretreatment includes the following steps: S301, soaking the ion exchange resin in clean water for 24 hours, then soaking it in 5%-10% hydrochloric acid solution for 8-12 hours, stirring it every 2-3 hours during the soaking process, and then rinsing it with clean water until it is neutral; the stirring speed is 30-50 rpm; S302, then soaking in 4%-6% sodium hydroxide solution for 8-12 hours, stirring every 2-3 hours during the soaking process, and finally rinsing with clean water again until neutral and draining, thereby completing the pretreatment, the stirring speed is 30-50 rpm.

5. The zero-discharge treatment process for wastewater from a thermal power plant according to claim 1, characterized in that: In step S3, the pretreated resin is loaded into the ion exchange device and operated, and the mother liquid is uniformly transported to the ion exchange device, including the following steps: S3001, loading the pretreated resin into the ion exchange column, laying a quartz sand support layer at the bottom of the column during loading, and performing a sealing inspection and a pressure resistance test on the ion exchange column after loading; S3002, after the measurement is completed, the mother liquor is controlled by the delivery pump to enter the ion exchange column at a uniform speed, and the impurity ion concentration is monitored by an online ion concentration monitor to determine the adsorption saturation of the ion exchange resin, and the pressure in the column is monitored by a pressure sensor, so as to obtain the mother liquor from which the impurity ions are removed; S3003. When the ion exchange resin is saturated with adsorption, the amount of regenerant is calculated based on the total amount of ions adsorbed by the resin and the stoichiometric relationship between the regenerant and the exchanged ions. At the same time, the resin is regenerated using the corresponding regenerant, and after regeneration, the resin is rinsed with clean water to restore the initial ion exchange state.

6. The zero-discharge treatment process for wastewater from a thermal power plant according to claim 1, characterized in that: The corresponding sensors in step S4 include a temperature sensor, a pressure sensor, a liquid level sensor, an ion concentration monitor, and a flow sensor.

7. The zero-discharge treatment process for wastewater from a thermal power plant according to claim 1, characterized in that: The analysis by big data analysis technology in step S4 includes the following steps: S401, data cleaning: remove outliers and duplicate data in the collected data to obtain basic data; S402, feature extraction: extracting parameter features related to process operation from basic data; S403, correlation analysis: Analyze the relationship between various data through process simulation software, and build a mathematical model based on the actual process flow and equipment parameters. Substitute the real-time collected data into the model for simulation calculation to analyze the influence of various parameters on the overall processing effect.

8. The zero-discharge treatment process for wastewater from a thermal power plant according to claim 7, characterized in that: The parameter characteristics in step S402 include the temperature fluctuation range and the ion concentration change trend. The treatment effect in step S403 includes the quality of crystallized salt, the salt recovery rate, and the system energy consumption. The mutual relationship includes the correlation between the evaporation temperature and the crystallized salt particle size, and the correlation between the ion exchange flow rate and the resin adsorption saturation time.

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